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Table 4 Cox regression analysis. Risk of revision due to deep infection for the low-risk patienta in four different procedure duration groups

From: Patient and surgical factors affecting procedure duration and revision risk due to deep infection in primary total knee arthroplasty

 

Cox regressiond

Unadjusted

Adjusted

Procedure duration

No of TKA

No of revisionsb

K-M 1y %c

K-M 4y %c

HR (95% CI)

p-value

HR (95% CI)

p-value

<75

3232

31

0.68

1.00

1

 

1

 

75-89

3718

30

0.57

0.84

0.8 (0.5 - 1.4)

0.5

0.8 (0.5 - 1.3)

0.4

90-109

5130

44

0.49

0.78

0.9 (0.6 – 1.4)

0.6

0.8 (0.5 – 1.3)

0.4

≥110

4177

52

0.72

1.10

1.2 (0.8 – 1.9)

0.3

1.1 (0.7 – 1.7)

0.6

  1. aThe low-risk TKA patient: TKA patient with primary osteoarthritis, ASA 1 or 2, without any previous surgery to the knee and no registered perioperative complications (n = 16,257)
  2. bNumber of revisions due to deep infection (n = 157)
  3. cKaplan-Meier estimated proportion of revisions due to deep infection at 1 and 4 years follow-up
  4. dUnadjusted and adjusted Hazard ratios (HR) estimated with the Cox proportional hazards model, adjusted for sex and age